Patents by Inventor Anand P. Narayan

Anand P. Narayan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 8514910
    Abstract: A controller for advanced receivers configures a plurality of advanced receiver modules based on figures of merit computed on the input signal. The controller also selects the appropriate output signal based on figures of merit of either the input or the output signals. The controller decisions can also be made in a bursty manner, where only a subset of the decisions to be made are made at a given time, thereby limiting the processing load of the control processor.
    Type: Grant
    Filed: May 2, 2012
    Date of Patent: August 20, 2013
    Assignee: Rambus Inc.
    Inventors: Brian Lee Roberts, Kenneth C Grobaski, Anand P Narayan
  • Patent number: 8457263
    Abstract: A receiver in a CDMA system comprises a front end processor that generates a combined signal per source. A symbol estimator processes the combined signal to produce symbol estimates. An S-Matrix Generation module refines these symbol estimates based on the sub channel symbol estimates. An interference canceller is configured for cancelling interference from at least one of the plurality of received signals for producing at least one interference-cancelled signal.
    Type: Grant
    Filed: August 8, 2011
    Date of Patent: June 4, 2013
    Assignee: Rambus Inc.
    Inventors: Gagandeep Singh Lamba, Tommy Guess, Michael McCloud, Anand P. Narayan
  • Patent number: 8391338
    Abstract: A receiver in a CDMA system comprises a front end processor that generates a combined signal per source. A symbol estimator processes the combined signal to produce symbol estimates. An S-Matrix Generation module refines these symbol estimates based on the sub channel symbol estimates. An interference canceller is configured for cancelling interference from at least one of the plurality of received signals for producing at least one interference-cancelled signal.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: March 5, 2013
    Assignee: Rambus Inc.
    Inventors: Gagandeep Singh Lamba, Tommy Guess, Michael McCloud, Anand P. Narayan, Prashant Jain
  • Patent number: 8374299
    Abstract: An interference cancelling receiver combines data from multiple paths after aligning to transmitter timing, and uses either an equalizer or a Rake receiver to compute symbol estimates. Interference estimates are generated from the symbol estimates, and multiple interference estimates are combined after re-aligning the interference estimates to receiver timing. At least two segments of symbol estimates are computed for each segment of interference cancelled data. Various techniques may be employed for controlling the latency and sequencing of these operations, and the subsystems within the canceller may use different processing clock speeds.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: February 12, 2013
    Assignee: Rambus Inc.
    Inventors: Eric S. Olson, Anand P. Narayan, John K. Thomas
  • Publication number: 20120213252
    Abstract: A controller for advanced receivers configures a plurality of advanced receiver modules based on figures of merit computed on the input signal. The controller also selects the appropriate output signal based on figures of merit of either the input or the output signals. The controller decisions can also be made in a bursty manner, where only a subset of the decisions to be made are made at a given time, thereby limiting the processing load of the control processor.
    Type: Application
    Filed: May 2, 2012
    Publication date: August 23, 2012
    Applicant: RAMBUS INC.
    Inventors: Brian Lee Roberts, Kenneth C. Grobaski, Anand P. Narayan
  • Publication number: 20120195360
    Abstract: An interference cancelling receiver combines data from multiple paths after aligning to transmitter timing, and uses either an equalizer or a Rake receiver to compute symbol estimates. Interference estimates are generated from the symbol estimates, and multiple interference estimates are combined after re-aligning the interference estimates to receiver timing. At least two segments of symbol estimates are computed for each segment of interference cancelled data. Various techniques may be employed for controlling the latency and sequencing of these operations, and the subsystems within the canceller may use different processing clock speeds.
    Type: Application
    Filed: December 8, 2011
    Publication date: August 2, 2012
    Applicant: RAMBUS INC.
    Inventors: Anand P. Narayan, Greg Graham, David R. Meyer, Prashant Jain
  • Patent number: 8179946
    Abstract: A controller for advanced receivers configures a plurality of advanced receiver modules based on figures of merit computed on the input signal. The controller also selects the appropriate output signal based on figures of merit of either the input or the output signals. The controller decisions can also be made in a bursty manner, where only a subset of the decisions to be made are made at a given time, thereby limiting the processing load of the control processor.
    Type: Grant
    Filed: November 20, 2008
    Date of Patent: May 15, 2012
    Assignee: Rambus Inc.
    Inventors: Brian Lee Roberts, Kenneth C Grobaski, Anand P Narayan
  • Patent number: 8121177
    Abstract: A receiver in a CDMA system comprises a front end processor that generates a combined signal per source. A symbol estimator processes the combined signal to produce symbol estimates. An S-Matrix Generation module refines these symbol estimates based on the sub channel symbol estimates. An interference canceller is configured for cancelling interference from at least one of the plurality of received signals for producing at least one interference-cancelled signal.
    Type: Grant
    Filed: November 17, 2010
    Date of Patent: February 21, 2012
    Assignee: Rambus Inc.
    Inventors: Anand P. Narayan, Eric S. Olson, Prashant Jain, John K. Thomas
  • Publication number: 20120027138
    Abstract: A receiver employs low-rate processing to synthesize the effect of high-rate interference in a received multi-rate signal. Each high-rate subchannel is analyzed on its low-rate descendents to produce symbol estimates for each low-rate symbol interval. The symbol estimates are applied to low-rate descendent subchannels, which are then combined to synthesize the effects of the high-rate interference. An interference canceller processes the synthesized interference with the received signal for producing an interference-cancelled signal. Alternatively, analogous steps may be applied at high-rate to analyze, synthesize, and cancel the effects of low-rate interference in a multi-rate signal.
    Type: Application
    Filed: October 5, 2011
    Publication date: February 2, 2012
    Applicant: RAMBUS INC.
    Inventors: Vijay Nagarajan, Louis L. Scharf, Anand P. Narayan
  • Patent number: 8090006
    Abstract: A receiver in a CDMA system comprises a front end processor that generates a combined signal per source. A symbol estimator processes the combined signal to produce symbol estimates. An S-Matrix Generation module refines these symbol estimates based on the sub channel symbol estimates. An interference canceller is configured for cancelling interference from at least one of the plurality of received signals for producing at least one interference-cancelled signal.
    Type: Grant
    Filed: October 29, 2010
    Date of Patent: January 3, 2012
    Assignee: Rambus Inc.
    Inventors: Anand P. Narayan, Eric S. Olson
  • Patent number: 8085889
    Abstract: An interference cancelling receiver combines data from multiple paths after aligning to transmitter timing, and uses either an equalizer or a Rake receiver to compute symbol estimates. Interference estimates are generated from the symbol estimates, and multiple interference estimates are combined after re-aligning the interference estimates to receiver timing. At least two segments of symbol estimates are computed for each segment of interference cancelled data. Various techniques may be employed for controlling the latency and sequencing of these operations, and the subsystems within the canceller may use different processing clock speeds.
    Type: Grant
    Filed: September 19, 2007
    Date of Patent: December 27, 2011
    Assignee: Rambus Inc.
    Inventors: Anand P Narayan, Greg Graham, David R Meyer, Prashant Jain
  • Publication number: 20110292974
    Abstract: A receiver in a CDMA system comprises a front end processor that generates a combined signal per source. A symbol estimator processes the combined signal to produce symbol estimates. An S-Matrix Generation module refines these symbol estimates based on the sub channel symbol estimates. An interference canceller is configured for cancelling interference from at least one of the plurality of received signals for producing at least one interference-cancelled signal.
    Type: Application
    Filed: August 8, 2011
    Publication date: December 1, 2011
    Applicant: RAMBUS INC.
    Inventors: Gagandeep Singh Lamba, Tommy Guess, Michael McCloud, Anand P. Narayan
  • Patent number: 8005128
    Abstract: A receiver in a CDMA system comprises a front end processor that generates a combined signal per source. A symbol estimator processes the combined signal to produce symbol estimates. An S-Matrix Generation module refines these symbol estimates based on the subchannel symbol estimates. An interference canceller is configured for cancelling interference from at least one of the plurality of received signals for producing at least one interference-cancelled signal.
    Type: Grant
    Filed: August 17, 2007
    Date of Patent: August 23, 2011
    Assignee: Rambus Inc.
    Inventors: Gagandeep Singh Lamba, Tommy Guess, Michael McCloud, Anand P Narayan
  • Publication number: 20110182330
    Abstract: An interference cancelling receiver combines data from multiple paths after aligning to transmitter timing, and uses either an equalizer or a Rake receiver to compute symbol estimates. Interference estimates are generated from the symbol estimates, and multiple interference estimates are combined after re-aligning the interference estimates to receiver timing. At least two segments of symbol estimates are computed for each segment of interference cancelled data. Various techniques may be employed for controlling the latency and sequencing of these operations, and the subsystems within the canceller may use different processing clock speeds.
    Type: Application
    Filed: March 30, 2011
    Publication date: July 28, 2011
    Applicant: RAMBUS INC.
    Inventors: Eric S. Olson, Anand P. Narayan, John K. Thomas
  • Publication number: 20110096767
    Abstract: A multi-mode receiver includes a channel decomposition module (e.g., a Rake receiver) for separating a received signal into multipath components, an interference selector for selecting interfering paths and subchannels, a synthesizer for synthesizing interference signals from selected sub channel symbol estimates, and an interference canceller for cancelling selected interference in the received signal. At least one of the channel decomposition module, the synthesizer, and the interference canceller are configurable for processing multi-mode signals.
    Type: Application
    Filed: December 13, 2010
    Publication date: April 28, 2011
    Applicant: RAMBUS INC.
    Inventors: Anand P. Narayan, John K. Thomas, Eric S. Olson
  • Publication number: 20110069742
    Abstract: A receiver in a CDMA system comprises a front end processor that generates a combined signal per source. A symbol estimator processes the combined signal to produce symbol estimates. An S-Matrix Generation module refines these symbol estimates based on the sub channel symbol estimates. An interference canceller is configured for cancelling interference from at least one of the plurality of received signals for producing at least one interference-cancelled signal.
    Type: Application
    Filed: November 17, 2010
    Publication date: March 24, 2011
    Applicant: RAMBUS INC.
    Inventors: Anand P. Narayan, Eric S. Olson, Prashant Jain, John K. Thomas
  • Publication number: 20110064172
    Abstract: A receiver in a CDMA system comprises a front end processor that generates a combined signal per source. A symbol estimator processes the combined signal to produce symbol estimates. An S-Matrix Generation module refines these symbol estimates based on the sub channel symbol estimates. An interference canceller is configured for cancelling interference from at least one of the plurality of received signals for producing at least one interference-cancelled signal.
    Type: Application
    Filed: October 29, 2010
    Publication date: March 17, 2011
    Applicant: RAMBUS INC.
    Inventors: Eric S. Olson, Anand P. Narayan
  • Publication number: 20110064066
    Abstract: A receiver in a CDMA system comprises a front end processor that generates a combined signal per source. A symbol estimator processes the combined signal to produce symbol estimates. An S-Matrix Generation module refines these symbol estimates based on the sub channel symbol estimates. An interference canceller is configured for cancelling interference from at least one of the plurality of received signals for producing at least one interference-cancelled signal.
    Type: Application
    Filed: October 29, 2010
    Publication date: March 17, 2011
    Applicant: RAMBUS INC.
    Inventors: Gagandeep Singh Lamba, Tommy Guess, Michael McCloud, Anand P. Narayan, Prashant Jain
  • Publication number: 20100323624
    Abstract: The present invention is directed to the selective provision of interference canceled signal streams to demodulating fingers in a communication receiver. According to the present invention, potential interferer signal paths are identified. Signal streams having one or more potential interferer signals removed or canceled are created, and a correlation is performed to determine whether the strength of a desired signal path increased as a result. If the correlation indicates that the strength of a desired signal path was increased by the signal cancellation, the interference canceled signal stream is provided to the demodulation finger assigned to track the desired signal path. If the correlation determines that the strength of the desired signal path did not increase as a result of performing interference cancellation, the raw or a different interference canceled signal stream is provided to the demodulation finger.
    Type: Application
    Filed: August 30, 2010
    Publication date: December 23, 2010
    Applicant: RAMBUS INC.
    Inventors: Anand P. Narayan, Eric S. Olson, Prashant Jain
  • Patent number: 7787518
    Abstract: The present invention is directed to the selective provision of interference canceled signal streams to demodulating fingers in a communication receiver. According to the present invention, potential interferer signal paths are identified. Signal streams having one or more potential interferer signals removed or canceled are created, and a correlation is performed to determine whether the strength of a desired signal path increased as a result. If the correlation indicates that the strength of a desired signal path was increased by the signal cancellation, the interference canceled signal stream is provided to the demodulation finger assigned to track the desired signal path. If the correlation determines that the strength of the desired signal path did not increase as a result of performing interference cancellation, the raw or a different interference canceled signal stream is provided to the demodulation finger.
    Type: Grant
    Filed: September 23, 2003
    Date of Patent: August 31, 2010
    Assignee: Rambus Inc.
    Inventors: Anand P. Narayan, Eric S. Olson, Prashant Jain